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WO2008026663A1 - Procédé et terminal de communication sans fil - Google Patents

Procédé et terminal de communication sans fil Download PDF

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Publication number
WO2008026663A1
WO2008026663A1 PCT/JP2007/066814 JP2007066814W WO2008026663A1 WO 2008026663 A1 WO2008026663 A1 WO 2008026663A1 JP 2007066814 W JP2007066814 W JP 2007066814W WO 2008026663 A1 WO2008026663 A1 WO 2008026663A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission power
carrier
power difference
transmission
communication terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2007/066814
Other languages
English (en)
Japanese (ja)
Inventor
Kugo Morita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to US12/439,136 priority Critical patent/US8346178B2/en
Publication of WO2008026663A1 publication Critical patent/WO2008026663A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/08—Closed loop power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0066—Requirements on out-of-channel emissions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range

Definitions

  • the present invention relates to a radio communication method in the uplink direction by a multicarrier using a plurality of carriers, and a radio communication terminal that performs communication using the multicarrier.
  • 3GPP2 3rd Generation Partnership Project 2
  • Le multi-carrier
  • a wireless communication terminal In the case of multi-carrier, a wireless communication terminal (Access Terminal) generally adopts a configuration in which a plurality of carriers are transmitted using the same wireless communication circuit from the viewpoints of downsizing and manufacturing cost reduction. . Therefore, in order to reduce interference between adjacent carriers with a predetermined frequency interval (1.25 MHz interval), the transmission power difference between adjacent carriers should be kept within a predetermined threshold (MaxRLTxPwrDiff, for example, 15 dB). (For example, Non-Patent Document 1).
  • Non-Patent Document 1 "cdma2000 High Rate Packet Data Air Interface 3GPP2 C.S0024-B Version 1.0", 3GPP2, June 2006
  • 3GPP2 stipulates that the transmission power difference between adjacent carriers be suppressed within a predetermined threshold (MaxRL TxPwrDiff). However, depending on the state of communication between the wireless communication terminal and the wireless base station (Access Network), it may not be possible to maintain the transmission power difference within a predetermined threshold! /.
  • a wireless communication terminal moves away from a first wireless base station that performs communication using a first carrier and is adjacent to the first carrier with a predetermined frequency interval. If you are communicating with the second radio base station! /, The wireless communication terminal needs to increase the transmission power of the first carrier in order to maintain communication with the first wireless base station using the first carrier. Furthermore, the wireless communication terminal reduces the transmission power of the second carrier as it approaches the second wireless base station.
  • the radio communication terminal maintains the transmission power difference within a predetermined threshold. May not be possible.
  • the present invention has been made in view of such a situation, and continues multi-carrier communication while suppressing interference between adjacent carriers having a predetermined frequency interval. It is an object of the present invention to provide a wireless communication method and a wireless communication terminal that can perform communication.
  • One feature of the present invention is that the first carrier and a multicarrier using at least a second carrier adjacent to the first carrier having a predetermined frequency interval are used in the uplink direction.
  • a wireless communication method for calculating a transmission power difference between a transmission power value of the first carrier and a transmission power value of the second carrier; and wherein the transmission power difference is the first carrier and the Determining whether or not a threshold set based on a maximum transmission power difference allowed with a second carrier exceeds a threshold, and a threshold set based on the maximum transmission power difference The transmission of uplink data using a carrier having a large transmission power value among the first carrier and the second carrier is stopped for a certain period of time. .
  • the transmission power difference in the step of calculating the transmission power difference, is calculated at a predetermined period, and is calculated for each predetermined period.
  • the wireless communication method includes a step of determining whether or not the transmission power difference is increased based on the transmission power difference, and the transmission power difference increases in a step of stopping transmission of the uplink data. If it is determined that the first carrier Further, the gist is to stop transmission of uplink data using a carrier having a large transmission power value among the second carriers for a certain period.
  • One feature of the present invention is that communication is performed by a multicarrier using at least a first carrier and a second carrier adjacent to the first carrier having a predetermined frequency interval.
  • a transmission power difference calculation unit (transmission power difference calculation unit 22) that calculates a transmission power difference between the transmission power value of the first carrier and the transmission power value of the second carrier; Whether or not the transmission power difference calculated by the transmission power difference calculation unit exceeds a threshold set based on a maximum transmission power difference allowed between the first carrier and the second carrier.
  • a transmission power difference determination unit (transmission power difference calculation unit 22) that determines whether or not the transmission power difference exceeds a threshold set based on the maximum transmission power difference.
  • the first carrier and the previous The gist is to include a communication control unit (communication control unit 23) that stops transmission of uplink data using a carrier having a large transmission power value among the second carriers for a certain period of time.
  • the transmission power difference calculation unit calculates the transmission power difference in a predetermined cycle
  • the transmission power difference calculation unit calculates
  • the wireless communication terminal further includes a power difference tendency determination unit (transmission power difference determination unit 25) for determining whether or not the transmission power difference is increased based on the transmission power difference calculated in A carrier having a large transmission power value among the first carrier and the second carrier when the communication control unit determines that the transmission power difference is increased by the power difference tendency determination unit.
  • the gist of this is to stop the transmission of uplink data using the.
  • a radio communication method and a radio communication terminal capable of continuing multi-carrier communication while suppressing interference between adjacent carriers having a predetermined frequency interval Can be provided.
  • FIG. 1 is a diagram showing an overall schematic configuration of a communication system 300 according to the first embodiment of the present embodiment.
  • FIG. 2 is a diagram showing an upstream frequency band according to the first embodiment of the present invention.
  • FIG. 3 is a block diagram of the radio communication terminal 10 according to the first embodiment of the present invention.
  • FIG. 4 is a functional block configuration diagram of the control unit 20 according to the first embodiment of the present invention.
  • FIG. 5 is a diagram showing an uplink data transmission method according to the first embodiment of the present invention.
  • FIG. 6 is a flowchart showing an operation of the radio communication terminal 10 according to the first embodiment of the present invention (part 1).
  • FIG. 7 is a flowchart showing the operation of the wireless communication terminal 10 according to the first embodiment of the present invention (part 2).
  • FIG. 8 is a functional block configuration diagram of a control unit 20 according to the second embodiment of the present invention.
  • FIG. 9 is a diagram for explaining calculation of an estimated curve difference (a difference calculated by an estimated curve equation for each carrier) according to the second embodiment of the present invention.
  • FIG. 10 is a flowchart showing an operation of the radio communication terminal 10 according to the second embodiment of the present invention.
  • FIG. 11 is a flowchart showing the operation of the radio communication terminal 10 according to the third embodiment of the present invention.
  • FIG. 12 is a diagram showing an uplink data transmission method according to the third embodiment of the present invention.
  • FIG. 1 shows an overall schematic configuration of a communication system 300 according to the first embodiment of the present embodiment.
  • the communication system 300 includes a plurality of wireless communication terminals 10 (wireless communication terminals 10a to 10c) and a plurality of wireless base stations 100 (wireless base stations 100a and radio).
  • Radio communication terminal 10 transmits uplink data to radio base station 100 using an uplink frequency band allocated for uplink data transmission. Specifically, the uplink frequency band is divided into a plurality of carriers. Radio communication terminal 10 transmits uplink data to radio base station 100 by bundling and using a plurality of carriers in an upper layer (multicarrier).
  • Radio communication terminal 10 receives downlink data from radio base station 100 using a downlink frequency band assigned to transmission of downlink data. Specifically, the downlink frequency band is divided into a plurality of carriers. Then, the radio communication terminal 10 uses the multiple carriers bundled in the upper layer to use the downlink data for the radio base station 1
  • the radio communication terminal 10 may communicate with a single radio base station 100, like the radio communication terminal 10a and the radio communication terminal 10c.
  • the wireless communication terminal 10 is a wireless communication terminal
  • Communication with a plurality of radio base stations 100 may be performed as in 10b.
  • Radio base station 100 receives uplink data from radio communication terminal 10 using an uplink frequency band assigned to receive uplink data. Also, the radio base station 100 transmits the downlink data to the radio communication terminal 10 using the downlink frequency band assigned for the transmission of the downlink data.
  • the base station control device 200 manages communication performed between the radio communication terminal 10 and the radio base station 100.
  • Base station controller 200 is a radio base station with which radio communication terminal 10 communicates
  • the radio communication terminal 10 controls the transmission power of the uplink data based on the reception power of the downlink data received from the radio base station 100. -Perform open loop control. Further, the radio communication terminal 10 performs closed loop control for controlling the transmission power of the uplink data based on the power control information received from the radio base station 100.
  • the power control information is information generated based on the reception quality (for example, signal to interference ratio (SIR)) of the uplink data received by the radio base station 100 from the radio communication terminal 10.
  • SIR signal to interference ratio
  • FIG. 2 shows an uplink frequency band according to the first embodiment of the present invention.
  • the upstream frequency band is divided into a plurality of carriers (carrier # 1 to carrier #n).
  • the center frequency of each carrier is f (l) to f (n), respectively.
  • the center frequencies of the carriers are adjacent to each other with a predetermined frequency interval (for example, 1.25 MHz). In the following, two carriers having adjacent center frequencies are referred to as adjacent carriers.
  • FIG. 3 is a block configuration diagram showing the radio communication terminal 10 according to the first embodiment of the present invention. Since the wireless communication terminal 10a to the wireless communication terminal 10c have the same configuration, they will be collectively referred to as the wireless communication terminal 10 below.
  • the radio communication terminal 10 includes an antenna 11, an RF / IF converter 12, a power amplifier 13, an audio input / output unit 14, a video input / output unit 15, and codec processing.
  • a unit 16, a baseband processing unit 17, an operation unit 18, a memory 19, and a control unit 20 are included.
  • the antenna 11 receives a signal (reception signal) transmitted by the radio base station 100.
  • the antenna 11 transmits a signal (transmission signal) to the radio base station 100.
  • the RF / IF converter 12 converts the frequency (Radio Frequency (RF)) of the received signal received by the antenna 11 into a frequency (Intermediate Frequency (IF)) determined by the baseband processing unit 17.
  • the RF / IF converter 12 is a baseband processing unit 17.
  • the frequency (IF) of the transmission signal acquired from the above is converted to the frequency (RF) used in wireless communication.
  • the RF / IF converter 12 inputs the transmission signal converted into the radio frequency (RF) to the power amplifier 13.
  • the power amplifier 13 amplifies the transmission signal acquired from the RF / IF converter 12.
  • the amplified transmission signal is input to the antenna 11.
  • the audio input / output unit 14 includes a microphone 14a that collects audio and a speaker 14b that outputs audio.
  • the microphone 14a is a codec processing unit that converts an audio signal based on the collected audio 1
  • the speaker 14b outputs audio based on the audio signal acquired from the codec processing unit 16.
  • the video input / output unit 15 includes a camera 15a that captures an image of a subject, and a display unit 15b that displays characters, video, and the like.
  • the camera 15a inputs a video signal to the codec processing unit 16 based on the captured video (still image or moving image).
  • the display unit 15b displays a video based on the video signal acquired from the codec processing unit 16.
  • the display unit 15b also displays characters input using the operation unit 18.
  • the codec processing unit 16 processes the audio signal according to a predetermined encoding method (for example, EVRC (Enhanced Variable Rate Codec), AMR (Advanced Multi Rate Codec), or G.729 defined by ITU-T).
  • a predetermined encoding method for example, EVRC (Enhanced Variable Rate Codec), AMR (Advanced Multi Rate Codec), or G.729 defined by ITU-T.
  • the audio codec processing unit 16a performs encoding and decoding
  • the video codec processing unit 16b performs encoding and decoding of a video signal in accordance with a predetermined encoding method (for example, MPEG-4).
  • the audio codec processing unit 16a encodes the audio signal acquired from the audio input / output unit 14.
  • the audio codec processing unit 16a decodes the audio signal acquired from the baseband processing unit 17.
  • the video codec processing unit 16b encodes the video signal acquired from the video input / output unit 15 and decodes the video signal acquired from the baseband processing unit 17.
  • the baseband processing unit 17 modulates a transmission signal and demodulates a reception signal according to a predetermined modulation method (QPSK or 16QAM) or the like. Specifically, the baseband processing unit 17 modulates a baseband signal such as an audio signal or a video signal acquired from the codec processing unit 16. The modulated baseband signal (transmission signal) is input to the RF / IF converter 12. The baseband processing unit 17 demodulates the received signal acquired from the RF / IF converter 12. To do. The demodulated received signal (baseband signal) is input to the codec processing unit 16
  • the baseband processing unit 17 modulates the information generated by the control unit 20.
  • the modulated information (transmission signal) is input to the RF / IF converter 12. Further, the baseband processing unit 17 demodulates the received signal acquired from the RF / IF converter 12. The demodulated received signal is input to the control unit 20.
  • the operation unit 18 is a key group composed of an input key for inputting characters and numbers, a response key for responding to an incoming call (calling), an outgoing call key for outgoing (calling), and the like. Further, when each key is pressed, the operation unit 18 inputs an input signal corresponding to the pressed key to the control unit 20.
  • the memory 19 stores a program for controlling the operation of the wireless communication terminal 10, various data such as an outgoing / incoming history and an address book.
  • the memory 19 includes, for example, a flash memory that is a nonvolatile semiconductor memory, an SRAM (Static Random Access Memory) that is a volatile semiconductor memory, or the like.
  • the control unit 20 controls the operation of the wireless communication terminal 10 (video input / output unit 15, codec processing unit 16, baseband processing unit 17 and the like) according to a program stored in the memory 19.
  • FIG. 4 is a functional block configuration diagram showing the control unit 20 according to the first embodiment of the present invention.
  • control unit 20 includes a transmission power control unit 21, a transmission power difference calculation unit 22, and a communication control unit 23.
  • the transmission power control unit 21 controls the transmission power of the uplink data for each carrier. Specifically, the transmission power control unit 21 sets the transmission power of the uplink data based on the reception quality (for example, SIR) of the downlink data received from the radio base station 100 that is the transmission destination of the uplink data. Control (open loop control).
  • the transmission power control unit 21 controls the transmission power of the uplink data based on the power control information received from the radio base station 100 that is the transmission destination of the uplink data (closed loop control). As described above, the power control information is received from the uplink data. This is information generated by the radio base station 100 based on quality (for example, SIR). The power control information requests a reduction or increase in transmission power of uplink data.
  • the transmission power difference calculation unit 22 determines the difference in uplink data transmission power for adjacent carriers.
  • transmission power difference (Hereinafter, transmission power difference) is calculated. Further, the transmission power difference calculation unit 22 determines whether or not the transmission power difference between the adjacent carriers exceeds the threshold set based on the maximum transmission power difference (MaxRLTxPwrDiff) allowed between the adjacent carriers. . When the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference, the transmission power difference calculation unit 22 determines that the transmission power difference between adjacent carriers is based on the maximum transmission power difference. Notify the communication control unit 23 that the set threshold value has been exceeded.
  • MaxRLTxPwrDiff maximum transmission power difference
  • the threshold set based on the maximum transmission power difference is a value smaller than the maximum transmission power difference (for example, a predetermined ratio (0.9)). Or the maximum transmission power difference).
  • Communication control unit 23 sets an uplink data transmission method based on a transmission power difference between adjacent carriers, and transmits uplink data based on the set transmission method.
  • the uplink data transmission method includes normal transmission in which uplink data using adjacent carriers is multiplexed and transmitted, and intermittent transmission in which uplink data using adjacent carriers are transmitted so as not to overlap on the time axis. Including.
  • the communication control unit 23 uses the adjacent carrier. Transmit uplink data using a time frame divided so as not to overlap on the time axis. Set intermittent transmission as the transmission method.
  • FIG. 5 shows details of the uplink data transmission method according to the first embodiment of the present invention.
  • FIG. 5 (a) shows a method of transmitting uplink data in the case where the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference! / ,! Normal transmission).
  • Fig. 5 (b) shows the uplink data transmission method (intermittent transmission) when the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference.
  • carrier # 1 and carrier # 2 are described as examples of adjacent carriers.
  • the transmission power difference between adjacent carriers exceeds the threshold set by V based on the maximum transmission power difference! / ,!
  • Uplink data using carrier # 1 and uplink data using carrier # 2 are multiplexed and transmitted. Specifically, in normal transmission, uplink data using carrier # 1 and uplink data using carrier # 2 are transmitted in a time frame that overlaps on the time axis.
  • the uplink direction using carrier # 1 Uplink data using data and carrier # 2 is transmitted so as not to overlap on the time axis. Specifically, in intermittent transmission, uplink data using carrier # 1 and uplink data using carrier # 2 are transmitted in a time frame that is divided so as not to overlap on the time axis. Is done.
  • FIG. 6 and 7 are flowcharts showing the operation of the wireless communication terminal 10 according to the first embodiment of the present invention.
  • the wireless communication terminal 10 transmits uplink data to the radio base station 100a using the carrier # 1, and transmits uplink data to the radio base station 100b using the carrier # 2. To do.
  • the main process of transmission power control is repeatedly executed at a predetermined cycle.
  • radio communication terminal 10 measures the reception quality of downlink data for carrier # 1. Specifically, the radio communication terminal 10 measures the reception quality of the downlink data received from the radio base station 100a that is the transmission destination of the uplink data to be transmitted using the carrier # 1. [0058] In step 11, radio communication terminal 10 measures the reception quality of downlink data for carrier # 2. Specifically, the radio communication terminal 10 measures the reception quality quality of the downlink data received from the radio base station 100b that is the transmission destination of the uplink data to be transmitted using the carrier # 2.
  • the radio communication terminal 10 determines the transmission power of the uplink data to be transmitted using the carrier # 1 by open loop control. Specifically, radio communication terminal 10 determines the transmission power of uplink data to be transmitted using carrier # 1, based on the reception quality measured in step 10.
  • the radio communication terminal 10 determines the transmission power of the uplink data to be transmitted using the carrier # 2 by open loop control. Specifically, radio communication terminal 10 determines the transmission power of uplink data to be transmitted using carrier # 2, based on the reception quality measured in step 11.
  • radio communication terminal 10 receives power control information for carrier # 1. Specifically, the radio communication terminal 10 receives power control information from the radio base station 100a that is a transmission destination of uplink data to be transmitted using carrier # 1. Note that the power control information is information generated by the radio base station 100a based on the reception quality of the uplink data transmitted using carrier # 1.
  • radio communication terminal 10 adjusts the transmission power of uplink data to be transmitted using carrier # 1 by closed loop control. Specifically, the radio communication terminal 10 adjusts the transmission power of the uplink data determined in step 12 based on the power control information received in step 14.
  • radio communication terminal 10 transmits uplink data using carrier # 1 with transmission power determined by open loop control and closed loop control.
  • the radio communication terminal 10 receives the power control information for the carrier # 2. Specifically, the radio communication terminal 10 receives power control information from the radio base station 100b that is a transmission destination of uplink data to be transmitted using the carrier # 2. The power control information is information generated by the radio base station 100b based on the reception quality of the uplink data transmitted using the carrier # 2.
  • radio communication terminal 10 adjusts the transmission power of uplink data to be transmitted using carrier # 2 by closed loop control. Specifically, the radio communication terminal 10 adjusts the transmission power of the uplink data determined in step 13 based on the power control information received in step 16.
  • radio communication terminal 10 transmits uplink data using carrier # 2 with transmission power determined by open loop control and closed loop control.
  • the transmission setting process interrupts the main process of transmission power control at a predetermined period.
  • the radio communication terminal 10 determines the difference in transmission power of uplink data (transmission power) for adjacent carriers (carrier # 1 and carrier # 2). Calculate the difference.
  • step 21 the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference (MaxRLTxPwrDiff).
  • the radio communication terminal 10 proceeds to the process of step 22.
  • the radio communication terminal 10 proceeds to the process of step 23.
  • the threshold set based on the maximum transmission power difference is a value smaller than the maximum transmission power difference (for example, a predetermined ratio) as described above. (0. 9) multiplied by the maximum transmission power difference)!
  • step 22 the radio communication terminal 10 sets intermittent transmission as the transmission method.
  • uplink data using adjacent carriers is transmitted in a time frame divided so as not to overlap on the time axis.
  • step 23 the radio communication terminal 10 determines whether or not intermittent transmission is set as the uplink data transmission method.
  • the radio communication terminal 10 proceeds to the process of step 24.
  • the wireless communication terminal 10 is not set to intermittent transmission as a method of transmitting uplink data. If not, go to step 25.
  • step 24 the radio communication terminal 10 cancels the intermittent transmission and sets normal transmission as the uplink data transmission method.
  • step 25 the radio communication terminal 10 transmits the uplink data according to the set transmission method.
  • the communication control unit 23 determines that the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference (MaxRLTxPwrDiff), Transmit uplink data using carrier by intermittent transmission (ie, transmit uplink data using adjacent carrier so as not to overlap on time axis)
  • multi-carrier communication can be continued while suppressing interference between adjacent carriers having a predetermined frequency interval.
  • the radio communication terminal 10 performs uplink data when the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference. Intermittent transmission is set as the transmission method.
  • the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers has increased, and the transmission power difference between adjacent carriers has increased. If the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference, intermittent transmission is set as the uplink data transmission method.
  • FIG. 8 is a functional block configuration diagram showing the control unit 20 of the wireless communication terminal 10 according to the second embodiment of the present invention. It should be noted that in FIG. 8, components similar to those in FIG. 4 are given the same reference numerals.
  • radio communication terminal 10 includes transmission power difference determination unit 25 in addition to transmission power control unit 21, transmission power difference calculation unit 22, and communication control unit 23.
  • the transmission power difference calculation unit 22 calculates the transmission power difference between adjacent carriers for each predetermined period (for example, the period in which the transmission power control unit 21 performs transmission power control).
  • the transmission power difference determination unit 25 determines whether or not the transmission power difference between adjacent carriers calculated by the transmission power difference calculation unit 22 every predetermined period is increasing. Specifically, the transmission power difference determination unit 25 calculates an estimation curve equation (hereinafter, an estimation curve equation) indicating a situation in which the uplink data transmission power changes on the time axis based on the uplink data transmission power. ) Is calculated for each adjacent carrier. Subsequently, the transmission power difference determination unit 25 determines whether or not the difference between the values calculated by the respective estimation curve formulas (hereinafter, “estimation curve difference”) exceeds the estimation curve difference threshold over a predetermined period. Determine. If the estimated curve difference between adjacent carriers exceeds the estimated curve threshold over a predetermined period, the transmission power difference determining unit 25 determines that the estimated curve difference between adjacent carriers is estimated over the predetermined period. Notify the communication control unit 23 that the threshold is exceeded.
  • an estimation curve equation hereinafter, an estimation curve equation
  • the notch period is determined by a notch interval calculated on the basis of reception intensity and reception quality (SIR). Specifically, the notch period includes a notch interval before the peak point and a notch interval after the peak point of the transmission power estimation curve.
  • the wireless communication terminal 10 sets intermittent transmission as the uplink data transmission method.
  • the transmission power difference determination unit 25 determines whether or not the estimated curve difference “P” calculated by the equations (1) to (4) exceeds the estimated curve difference threshold (P) over a predetermined period. Power.
  • estimated curve difference “P” is equal to the value calculated by the estimated curve formula “M (t)” and the downward estimated value.
  • the transmission power difference determination unit 25 determines that the estimated curve difference “P” is an estimated curve during the notch period.
  • the communication control unit 23 sets that the estimated curve difference between adjacent carriers exceeds the estimated curve threshold value over a predetermined period, and the transmission power difference between adjacent carriers is set based on the maximum transmission power difference. When notified that the threshold has been exceeded, intermittent transmission is set as the uplink data transmission method.
  • FIG. 10 is a flowchart showing the operation of the radio communication terminal 10 according to the second embodiment of the present invention. Note that the transmission setting process shown in FIG. 10 is executed in place of the transmission setting process shown in FIG.
  • the radio communication terminal 10 transmits uplink data to the radio base station 100a using the carrier # 1, and transmits uplink data to the radio base station 100b using the carrier # 2. To do. Further, it is assumed that the transmission power of carrier # 1 is larger than the transmission power of carrier # 2.
  • step 30 the radio communication terminal 10 has a transmission power of high V, based on the transmission power of the uplink data transmitted via the carrier # 1,! /, Calculate the estimated curve formula for carrier # 1.
  • Step 31 the radio communication terminal 10 uses the estimated curve formula (or the lower estimated curve) of the carrier # 2 based on the transmission power of the uplink data transmitted via the carrier # 2 having a low transmission power. Formula) is calculated.
  • step 32 the radio communication terminal 10 calculates the estimated curve equation of carrier # 1 calculated in step 30 and the estimated curve equation (or lower estimated curve equation) of carrier # 2 calculated in step 31. Based on the above, it is determined whether the transmission power difference between carrier # 1 and carrier # 2 exceeds the estimated curve difference threshold value. Specifically, the radio communication terminal 10 determines the difference (estimated curve) between the value calculated by the estimated curve equation of carrier # 1 and the value calculated by the estimated curve equation of carrier # 2 (or the lower estimated curve equation). Calculate the difference. Next, wireless communication terminal 1 0 determines whether or not the estimated curve difference exceeds the estimated curve difference threshold over a predetermined period.
  • step 32 If it is determined in step 32 that the estimated curve difference has exceeded the estimated curve difference threshold over a predetermined period, the radio communication terminal 10 proceeds to the processing in step 33. On the other hand, if it is determined in step 32 that the estimated curve difference does not exceed the estimated curve difference threshold for a predetermined period, the radio communication terminal 10 proceeds to the process of step 35.
  • step 33 radio communication terminal 10 determines whether or not the transmission power difference between carrier # 1 and carrier # 2 exceeds a threshold set based on the maximum transmission power difference. If it is determined in step 33 that the transmission power difference exceeds the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 34. On the other hand, when it is determined in step 33 that the transmission power difference does not exceed the threshold value set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 35.
  • step 34 the radio communication terminal 10 sets intermittent transmission as a method of transmitting uplink data using adjacent carriers.
  • radio communication terminal 10 determines whether or not intermittent transmission is set as the uplink data transmission method. When intermittent transmission is set as the uplink data transmission method, the radio communication terminal 10 proceeds to the process of step 36. On the other hand, when the intermittent transmission is not set as the uplink data transmission method, the radio communication terminal 10 proceeds to the process of step 37.
  • step 36 the radio communication terminal 10 cancels the intermittent transmission and sets the normal transmission as the uplink data transmission method.
  • step 37 the radio communication terminal 10 transmits the uplink data in accordance with the set transmission method.
  • the communication control unit 23 is not simply a case where the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference.
  • the transmission power difference between adjacent carriers exceeds the estimated curve difference threshold over a predetermined period If the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference, the uplink Set intermittent transmission as the direction data transmission method.
  • the transmission power of the carrier temporarily increases due to open-loop control or closed-loop control as reception quality deteriorates due to fading or the like.
  • the transmission power difference between adjacent carriers temporarily exceeds the threshold set based on the maximum transmission power difference, if the effect of fading is eliminated, the difference between adjacent carriers The transmission power difference is likely to be within the maximum transmission power difference.
  • unnecessary intermittent transmission is performed when the transmission power difference between adjacent carriers temporarily exceeds a threshold set based on the maximum transmission power difference. It is possible to suppress the communication.
  • the radio communication terminal 10 performs uplink data when the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference. Intermittent transmission is set as the transmission method.
  • the radio communication terminal 10 uses a threshold (Pth) in which the transmission power difference between adjacent carriers is set based on the maximum transmission power difference.
  • the transmission stop is set as the uplink data transmission method. In transmission stop, transmission of uplink data using a carrier having a large transmission power among adjacent carriers 1 A certain period until the transmission power difference between adjacent carriers falls below a threshold set based on the maximum transmission power difference It is stopped for (T ⁇ T).
  • FIG. 11 is a flowchart showing the operation of the radio communication terminal 10 according to the third embodiment of the present invention. Note that the transmission setting process shown in FIG. This is executed instead of the transmission setting process shown in FIG.
  • step 40 the radio communication terminal 10 determines the difference in transmission power of uplink data (transmission power) for adjacent carriers (carrier # 1 and carrier # 2). Calculate the difference.
  • Step 41 the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference (MaxRLTxPwrDiff). When the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 42. On the other hand, if the transmission power difference between adjacent carriers does not exceed the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 47.
  • MaxRLTxPwrDiff the maximum transmission power difference
  • the threshold set based on the maximum transmission power difference is a value smaller than the maximum transmission power difference which may be the maximum transmission power difference itself (for example, a predetermined ratio). (0. 9) multiplied by the maximum transmission power difference)!
  • step 42 the radio communication terminal 10 determines whether or not transmission stop is set as the uplink data transmission method using the adjacent carrier. If the transmission stop is set, the wireless communication terminal 10 proceeds to step 45. On the other hand, the wireless communication terminal 10 proceeds to the processing of step 43 when the transmission stop is not set.
  • step 43 the radio communication terminal 10 sets the transmission stop of the adjacent carriers as the uplink data transmission method.
  • step 44 the radio communication terminal 10 sets a predetermined waiting time in the timer.
  • the predetermined waiting time is a time shorter than the no-communication time used for determining whether or not the radio base station 100 instructs the radio communication terminal 10 to disconnect the carrier, Of these times, it is permissible to maintain a carrier with high transmission power. Note that the disconnection of the carrier means that the transmission of the carrier is stopped.
  • step 45 the radio communication terminal 10 determines whether or not a timer for which a predetermined waiting time has been set has timed out. If the timer has timed out, the radio communication terminal 10 proceeds to the process of step 46. On the other hand, in the case where the timer has timed out, the wireless communication terminal 10 proceeds to the processing of step 49. [0123]
  • step 46 the radio communication terminal 10 sets provisional transmission for tentatively transmitting uplink data using a carrier having high transmission power among neighboring carriers as a transmission method of the uplink data. As shown in FIG. 12, provisional transmission is transmission of uplink data in which the time required for transmission is short in order to maintain a carrier having a large transmission power among adjacent carriers. In provisional transmission, the radio communication terminal 10 transmits uplink data with transmission power at which the transmission power difference between adjacent carriers does not exceed the maximum transmission power difference.
  • step 47 the radio communication terminal 10 determines whether or not transmission stop is set as an uplink data transmission method using the adjacent carrier among the adjacent carriers! /. If the transmission stop is set, the wireless communication terminal 10 proceeds to the process of step 48. On the other hand, when the transmission stop is not set, the radio communication terminal 10 proceeds to the process of step 49.
  • step 48 the radio communication terminal 10 sets the cancellation of the transmission stop as the uplink data transmission method.
  • step 49 the wireless communication terminal 10 performs step 43, step 46, or step 4.
  • the uplink data is transmitted according to the transmission method set in 8.
  • the radio communication terminal 10 has a maximum transmission power difference between adjacent carriers. If it is not less than or equal to the threshold set based on the difference, the carrier with higher transmission power is disconnected from the adjacent carriers.
  • the radio communication terminal 10 is adjacent when the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference. Stop transmission of uplink data using a carrier having a large transmission power among the carriers for a certain period until the transmission power difference between adjacent carriers is equal to or less than a threshold set based on the maximum transmission power difference. .
  • Transmission may be set.
  • the predetermined threshold is determined according to how far the center frequencies of the two carriers are separated. Specifically, the greater the distance between the center frequencies of the two carriers, the lower the degree of interference between the two carriers. Therefore, the predetermined threshold is set to a low value.
  • the operation of the wireless communication terminal 10 according to the first to third embodiments described above can also be provided as a program executable on a computer.
  • uplink data transmission using a carrier having a large transmission power among adjacent carriers is stopped.
  • the number of slots may be set. Note that uplink data transmission using a carrier with low transmission power among adjacent carriers is performed in a slot in which transmission of uplink data using a carrier with high transmission power is stopped.
  • the wireless communication method and the wireless communication terminal according to the present invention have a predetermined frequency interval and continue multi-carrier communication while suppressing interference between adjacent carriers. Therefore, it is useful in wireless communication such as mobile communication.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de communication sans fil qui comprend une étape de calcul d'une différence de puissance de transmission entre une première valeur de puissance de transmission de porteuse et une second valeur de puissance de transmission de porteuse; une étape de décision quant à savoir si la différence de puissance de transmission est supérieure à une valeur seuil indiquant la différence de puissance de transmission maximum autorisée entre la première valeur de puissance de transmission de porteuse et la seconde valeur de puissance de transmission de porteuse ; et une étape d'arrêt, pour une certaine période, de la transmission des données en liaison montante dans laquelle la première porteuse ou la seconde porteuse ayant la plus grande valeur de puissance de transmission est utilisée, dans le cas où la différence de puissance de transmission excède la valeur seuil établie en fonction de la différence maximum de puissance de transmission.
PCT/JP2007/066814 2006-08-30 2007-08-29 Procédé et terminal de communication sans fil Ceased WO2008026663A1 (fr)

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KR101022151B1 (ko) 2011-03-17
US20100323642A1 (en) 2010-12-23
JP2008060797A (ja) 2008-03-13
JP4769666B2 (ja) 2011-09-07
KR20090035739A (ko) 2009-04-10
US8346178B2 (en) 2013-01-01

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